205040831 has 4 divisors (see below), whose sum is σ = 207154752. Its totient is φ = 202926912.

The previous prime is 205040827. The next prime is 205040863. The reversal of 205040831 is 138040502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205040831 - 2² = 205040827 is a prime.

It is a super-2 number, since 2×205040831² = 84083484754341122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205040797 and 205040806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205040821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056815 + ... + 1057008.

It is an arithmetic number, because the mean of its divisors is an integer number (51788688).

Almost surely, 2^205040831 is an apocalyptic number.

205040831 is a deficient number, since it is larger than the sum of its proper divisors (2113921).

205040831 is an equidigital number, since it uses as much as digits as its factorization.

205040831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113920.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 205040831 is about 14319.2468726536. The cubic root of 205040831 is about 589.6759984916.

The spelling of 205040831 in words is "two hundred five million, forty thousand, eight hundred thirty-one".